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  • Iron filings and sulphur were mixed together and divided into two parts, ‘A’ and ‘B’. Part ‘A’ was heated strongly while Part ‘B’ was not heated. Dilute hydrochloric acid was added to both the Parts and evolution of gas was seen in both the cases.

Iron filings and sulphur were mixed together and divided into two parts, ‘A’ and ‘B’. Part ‘A’ was heated strongly while Part ‘B’ was not heated. Dilute hydrochloric acid was added to both the Parts and evolution of gas was seen in both the cases. How will you identify the gases evolved?

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Solution:
Part A –
When iron and sulphur are heated they react with each other and form iron-sulphide.
Fe+S\rightarrow FeS
This iron sulphide can react with acid Hydrochloride and hydrogen Sulphide gas will come out from the mixture.
FeS+2HCl\rightarrow FeCl_{2}+H_{2}S(gas)
Hydrogen Sulphide has smell like rotten egg and can be identified easily.
This gas can be chemically tested by reaction with lead Salts.
Part B –
When iron and sulphur are heated they react with each other and form iron-sulphide but without heat they will remain unaffected.
Sulphur does not react with hydrochloride but iron will react and hydrogen gas will come out.
Fe+2HCl\rightarrow FeCl_{2}H_{2}(gas)
Hydrogen gas is highly inflammable and produces sound on burning.
If we bring any spark near the mixture, we can identify the hydrogen gas.

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